Summary The instructor and student departed the Toronto/Buttonville Municipal Airport, Ontario, on a training flight to the northeast. Approximately 50 minutes later, the aircraft struck the ground in the training/practice area and came to rest beside a road. Both occupants of the aircraft sustained fatal injuries during the impact. Ce rapport est galement disponible en franais. Other Factual Information Visual flight rules (VFR) weather conditions prevailed at the time of the occurrence. At 1200 eastern daylight time (EDT)(1), the weather at Toronto/Buttonville Municipal Airport, located 16 nautical miles (nm) to the southwest of the occurrence location, was reported as wind 330 degrees true at 12 knots, visibility 15 statute miles, broken cloud based at 3 800 feet above ground level (agl), temperature 18 degrees Celsius, dew-point 8 degrees Celsius, and altimeter setting 30.12 inches of mercury, with the remark that the broken layer of cloud was 5 octas. Records show that the instructor was licensed and qualified in accordance with all existing regulations to conduct the lesson. The instructor had received an instructor rating on 08 May 1998 and had accumulated approximately 398 total flying hours, 75 hours of which was instructing experience at the time of the occurrence. The student had accumulated approximately 6.1 hours of total flying time. Based on the medical information, there is no indication that either the instructor's or the student's performance was degraded by physiological factors. The planned exercises for the lesson during the flight were slow flight and stalls. The student's pilot training record indicates that the instructor had conducted the same two exercises during the previous lesson. These lessons would normally be carried out at an altitude such that recovery would have been completed by a minimum of 2 000 feet agl. It was not possible to determine at what altitude the instructor was conducting the lesson. The aircraft departed the Toronto/Buttonville Municipal Airport at approximately 1145 and was seen briefly just before impact travelling from north to south, parallel to a road. The aircraft's engine could be heard before the aircraft came into view, but shortly after it came into view the sound of the engine was greatly reduced. The nose of the aircraft pitched up, but then dropped down immediately. The aircraft was rolling significantly, alternating from left to right at an estimated altitude of less than 100 feet agl. It then disappeared from view and came to rest approximately 1 540 feet south of where it was last seen. The aircraft struck a tree with the right wing immediately before impacting the ground beside a road in a steep nose-down attitude which exceeded 60 degrees. The aircraft came to rest where it impacted the ground. A detailed examination of the aircraft, its systems, and the engine revealed no indication of any pre-existing damage which would have contributed to the cause of the accident or have prevented the engine from developing rated power. Examination of the spinner, the propeller, the carburettor, and the cockpit, and witness information indicate that the engine was probably at a low power setting. Witness marks on the control surfaces and on adjacent aircraft structures were noted. The flaps were retracted at the time of impact. The weight and centre of gravity were within the prescribed limits at the time of the occurrence.